#include <GUIConstants.au3>

 $Struct = DllStructCreate("int cxLeftWidth;int cxRightWidth;int cyTopHeight;int cyBottomHeight;")
 $sStruct = DllStructCreate("dword;int;ptr;int")

 Global $MyArea[4] = [50, 50, 50, 50]
#cs
 $GUI = GUICreate("Windows Vista DWM", 243, 243)
 $Apply = GUICtrlCreateButton("Apply", 80, 104, 83, 25, 0)
 $ICE = GUICtrlCreateButton("DWM Check", 80, 134, 83, 25, 0)
 GUISetState()

 While 1
     $iMsg = GUIGetMsg()
     Switch $iMsg
         Case $GUI_EVENT_CLOSE
             Exit
         Case $Apply
        ;_Vista_ApplyGlass($GUI)
        ;_Vista_EnableBlurBehind($GUI)
             _Vista_EnableBlurBehind($GUI)
         Case $ICE
             If _Vista_ICE() Then
                 MsgBox(0, "_Vista_ICE", "DWM is enabled!")
             Else
                 MsgBox(0, "_Vista_ICE", "DWM is NOT enabled!")
             EndIf
     EndSwitch
 WEnd
#ce
; #FUNCTION#;===============================================================================
;
; Name...........: _Vista_ApplyGlass
; Description ...: Applys glass effect to a window
; Syntax.........: _Vista_ApplyGlass($hWnd, [$bColor)
; Parameters ....: $hWnd - Window handle:
;                 $bColor  - Background color
; Return values .: Success - No return
;                 Failure - Returns 0
; Author ........: James Brooks
; Modified.......:
; Remarks .......: Thanks to weaponx!
; Related .......:
; Link ..........;
; Example .......; Yes
;
;;==========================================================================================
 Func _Vista_ApplyGlass($hWnd, $bColor = 0x000000)
     If @OSVersion <> "WIN_7" Then
         MsgBox(16, "_Vista_ApplyGlass", "You are not running Win 7!")
         Exit
     Else
         GUISetBkColor($bColor); Must be here!
         $Ret = DllCall("dwmapi.dll", "long", "DwmExtendFrameIntoClientArea", "hwnd", $hWnd, "long*", DllStructGetPtr($Struct))
         If @error Then
             Return 0
             SetError(1)
         Else
             Return $Ret
         EndIf
     EndIf
 EndFunc ;==>_Vista_ApplyGlass

; #FUNCTION#;===============================================================================
;
; Name...........: _Vista_ApplyGlassArea
; Description ...: Applys glass effect to a window area
; Syntax.........: _Vista_ApplyGlassArea($hWnd, $Area, [$bColor)
; Parameters ....: $hWnd - Window handle:
;                  $Area - Array containing area points
;                 $bColor  - Background color
; Return values .: Success - No return
;                 Failure - Returns 0
; Author ........: James Brooks
; Modified.......:
; Remarks .......: Thanks to monoceres!
; Related .......:
; Link ..........;
; Example .......; Yes
;
;;==========================================================================================
 Func _Vista_ApplyGlassArea($hWnd, $Area, $bColor = 0x000000)
     If @OSVersion <> "WIN_7" Then
         MsgBox(16, "_Vista_ApplyGlass", "You are not running Win 7!")
         Exit
     Else
         If IsArray($Area) Then
             DllStructSetData($Struct, "cxLeftWidth", $Area[0])
             DllStructSetData($Struct, "cxRightWidth", $Area[1])
             DllStructSetData($Struct, "cyTopHeight", $Area[2])
             DllStructSetData($Struct, "cyBottomHeight", $Area[3])
             GUISetBkColor($bColor); Must be here!
             $Ret = DllCall("dwmapi.dll", "long*", "DwmExtendFrameIntoClientArea", "hwnd", $hWnd, "ptr", DllStructGetPtr($Struct))
             If @error Then
                 Return 0
             Else
                 Return $Ret
             EndIf
         Else
             MsgBox(16, "_Vista_ApplyGlassArea", "Area specified is not an array!")
         EndIf
     EndIf
 EndFunc ;==>_Vista_ApplyGlassArea

; #FUNCTION#;===============================================================================
;
; Name...........: _Vista_EnableBlurBehind
; Description ...: Enables the blur effect on the provided window handle.
; Syntax.........: _Vista_EnableBlurBehind($hWnd)
; Parameters ....: $hWnd - Window handle:
; Return values .: Success - No return
;                 Failure - Returns 0
; Author ........: James Brooks
; Modified.......:
; Remarks .......: Thanks to komalo
; Related .......:
; Link ..........;
; Example .......; Yes
;
;;==========================================================================================
 Func _Vista_EnableBlurBehind($hWnd, $bColor = 0x000000)
     If @OSVersion <> "WIN_7" Then
         MsgBox(16, "_Vista_ApplyGlass", "You are not running Win 7!")
         Exit
     Else
         Const $DWM_BB_ENABLE = 0x00000001

         DllStructSetData($sStruct, 1, $DWM_BB_ENABLE)
         DllStructSetData($sStruct, 2, "1")
         DllStructSetData($sStruct, 4, "1")

         GUISetBkColor($bColor); Must be here!
         $Ret = DllCall("dwmapi.dll", "int", "DwmEnableBlurBehindWindow", "hwnd", $hWnd, "ptr", DllStructGetPtr($sStruct))
         If @error Then
             Return 0
         Else
             Return $Ret
         EndIf
     EndIf
 EndFunc ;==>_Vista_EnableBlurBehind

; #FUNCTION#;===============================================================================
;
; Name...........: _Vista_ICE
; Description ...: Returns 1 if DWM is enabled or 0 if not
; Syntax.........: _Vista_ICE()
; Parameters ....:
; Return values .: Success - Returns 1
;                 Failure - Returns 0
; Author ........: James Brooks
; Modified.......:
; Remarks .......: Thanks to BrettF
; Related .......:
; Link ..........;
; Example .......; Yes
;
;;==========================================================================================
 Func _Vista_ICE()
     $ICEStruct = DllStructCreate("int;")
     $Ret = DllCall("dwmapi.dll", "int", "DwmIsCompositionEnabled", "ptr", DllStructGetPtr($ICEStruct))
     If @error Then
         Return 0
     Else
         Return DllStructGetData($ICEStruct, 1)
     EndIf
 EndFunc ;==>_Vista_ICE